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0. A. BUTLER.

APPARATUS FOR BOILING SAP. A No. 271,786.- Patented Feb. 6, 1883:

UNITED STATES PATENT OFFICE.

' CHARLES A. BUTLER, or MORIAH, NEW YORK.

APPARATUS FOR BOILING SAP.

SPECIFICATION forming part of Letters Patent No. 271,786, dated February6, 1883.

- Application filed July 2 0, 1882. tNo'modcl.)

.To all whom it may cancer-n.-

Be it known that 1, CHARLES A. BUTLER, of Moriah, in the county of Essexand State of New York, have invented a new and useful Improvement inApparatus for Boiling Sap; and I do hereby declare that the followingis'a full, clear, and exact description of the same.

My invention relates to an improvement in apparatus for boiling andevaporating cane juice and sap in the manufacture of sugar;

and its object is to economize the heat used and to save a great portionwhich is ordinarily wasted, whereby a larger quantity may be boiled orevaporated by the same heat and the thoroughness, cleanliness, andefficiency of the process increased, and the process itself expedited.

The invention consists ininterposing between the reservoir of liquid sapand the evapcrating-pans an auxiliary heater,in which the liquid is keptrapidly boiling, and when in that condition evaporating faster onaccount of gaining more heating-surface by the use of this heater withtubes or flues therein placed, (as hereinafter more fully set forth,)and within a smaller space than by the use of any other pan or boilerheretofore used in the manufacture of sugar; and, further, in thepeculiar construction of said heater, and particularly in the peculiarconstruction, shape, and

arrangement of its tubes or fines, all as fully two of which are shown,one being situated directly over the grate and .the other to the rearthereof, a sufficient space being left hei e 3 to a reservoir F.

low the pans to form that air chamber or flue through which the productsof combustion pass below the evaporating-pans to l), the chimney orsmoke-exit. In the apparatus ordinarily used the bean-after passingbelow the pans, is carried to the-stack and wasted.

This heater consists of a rectangular chamber, constructed of metal andconnected by a The bottom of this flow-chute, which would permit theliquid to escape into the pan'should it boil sufficiently to make itnecessary. it will be understood that the lines open and connect withthe hotair space below the pans in front and communicate in the rearwith the stack or chimney, thus continuing the flueto the chimney, theheat from the fire-box thereby heating the flues (in its passage to thechimney) and the mass of liquid which surrounds the tines in the heater.By the use of tubes of flattened cross-section having their major axisplaced vertically the liquid is exposed to a much greater area ofradiating-surface, and the heating is much more thoroughly accomplishedthan it round tubes or simple partitions were used. The end of pipe 3connecting with the heater is provided with a valve workingautomatically' in said heater, similar to a ballvalvethat is,it isfurnished with a floatand as the liquid rises and reaches a given pointthe float rises, and by its rising closes the valve-and obstructs theflow until the liquid evaporates or flows into pans, when the floatdescends, opening the valve and causing an additional supply of sap toenter from the reservoir'.

Near the center of the heater, attached to These flues are i the outlet,is a valve of similar construction to' that described above, whichfloats in the pan to prevent an overflow of said pan, and by itsconstruction keeping the contents at a uniform height by opening thevalve when it evaporates sufficiently and closing it when full. The pansare connected by a siphon furnished with an air-chamber on its apex,which, as the contents boil away, conducts from one to the other. l

' I am aware that various devices have been employed for heating theliquid contained in an evaporating-pan; and I am also aware that anauxiliary heater for heating the sap before it is admitted to such panshas been employed;

IOO

specific construction of such heaters, I desire In testimony whereof Ihave signed'mynanie E0 to disclaim the broad invention thereof. to thisspecification in the presence of two sub- Having thus described myinvention, What I scribing witnesses. claim ist. I

In combination with the furnace, the pans, I )HARLES A. BUTLER.

and the reservoir, the intermediate heatingchamber, G, having theflattened tubes in the Witnesses:

bottom thereof, substantially as described, and J. R. GILMAN,

for the purpose set forth. Y FRED H. STIMPSON.

